The 'Hawaii Five-0' hunk - who already has a 15-year-old son Saxon from a previous relationship - and his model/surfer girlfriend Malia Jones welcomed their first child together on Thursday (25.10.12).

The couple only revealed they were dating in January and Malia also has a three-year-old son from a past relationship.

Alex's co-star Daniel Dae Kim tweeted: ''It's official: Congrats to Alex and Malia on their new blessing in a blankie! #H50 (sic).''

The happy arrival comes after a tough year for Alex in which he battled an addiction to prescription pills after injuring himself on the set of 'Hawaii Five-0'.

Speaking after his successful rehab treatment during the summer, the 36-year-old actor said: ''I'm doing great now.

''I got hurt pretty bad on the show and I ended up taking painkillers to get to work. I had trouble getting off them. That's as complicated as it gets.

''I get knocked around a lot on the show. I do a lot of my own stunts and I have done so from the beginning. I am not 20-something anymore as you can see from the dusting of grey on the sides of my head.

''It was really difficult for me to be away. The hardest part was like when something is so enormous in your life - I'm at work 14 hours every day- and then all of a sudden, you're not at work. I got a lot of letters and messages from people saying, 'Where are you?' or 'It's so weird not to see you in the show.'''